An ex military friend of mine introduced me to the phrase "Slow is smooth and smooth is fast".
It originated with sailors as a common practice, then was adopted by the Navy Seals as part of their serious training philosophy, which is where it has become more publicly recognized.
The basic idea is somewhat self explanatory, but there are some nuances that are worth learning about.
"Slow is smooth, and smooth is fast" - LessWrong
Slow is Smooth, Smooth is Fast - Lehi Jujitsu
While having its roots in nautical and military settings, the concept is now widely used in many other endeavors.
I tend to keep the idea in mind when I'm playing the electric bass and other musical instruments. Before I did, I was fast on the fretboard but tended to be sloppy. Since I began thinking this way, I've altered my practicing and playing techniques, and the result is a very much more smooth playing style, even at high speeds, that translates into being a better musician and a much better performer.
As an added bonus, I feel more mentally at ease when I'm playing. It's a less rushed feeling and more relaxed.